respond_with 在索引中使用时不包括嵌套资源

Question

我有以下类与 has_one 关系，我想 return 它嵌套在我的 index 方法中的 JSON 中。

class QuantitySample < ActiveRecord::Base
  has_one :quantity, :dependent => :destroy
  ...

class Quantity < ActiveRecord::Base
  belongs_to :quantity_sample
  ...

我想在 index 方法上使用 respond_with return 每个数量样本和与每个样本关联的数量对象：

class QuantitySamplesController < ApplicationController
  respond_to :json
  def index
    quantity_samples = current_user.quantity_samples
    respond_with quantity_samples, :include => {:quantity => {}}
  end
  ...

我没有用上面的代码得到嵌套/包含的数量对象。但是，如果我将 respond_with 替换为 to_json:

respond_to do |format|
  format.json do
    render :json => quantity_samples.to_json(:include => {:quantity => {}})
  end
end

:include 有效！

完整 JSON 结果：respond_to 我得到：

{"quantity_samples"=>[{"id"=>1, "start_date"=>"2016-01-04T07:38:40.694Z", "end_date"=>"2016-01-04T07:38:40.694Z", "user_id"=>1, "workout_id"=>nil, "created_at"=>"2016-01-04T07:38:41.328Z", "updated_at"=>"2016-01-04T07:38:41.328Z", "quantity_type"=>"HKQuantityTypeIdentifierDistanceWalkingRunning", "device"=>nil, "metadata"=>nil}]}

对比to_json:

[{"id"=>1, "start_date"=>"2016-01-04T07:36:09.415Z", "end_date"=>"2016-01-04T07:36:09.415Z", "user_id"=>1, "workout_id"=>nil, "created_at"=>"2016-01-04T07:36:10.110Z", "updated_at"=>"2016-01-04T07:36:10.110Z", "quantity_type"=>"HKQuantityTypeIdentifierDistanceWalkingRunning", "device"=>nil, "metadata"=>nil, "quantity"=>{"id"=>2, "value"=>4200.0, "unit"=>"m", "created_at"=>"2016-01-04T07:36:10.123Z", "updated_at"=>"2016-01-04T07:36:10.123Z", "name"=>nil, "quantity_sample_id"=>1}}]

为什么这不适用于 respond_with？

Answer 1

似乎对我有用。我只是复制了 link 提供的

中所做的事情

respond_to :json
def index
  quantity_samples = current_user.quantity_samples.to_json(include: :quantity)
  respond_with quantity_samples
end

respond_with 在索引中使用时不包括嵌套资源

respond_with when used in index does not include nested resources

json

ruby-on-rails

respond-with